Long Call Butterfly

A long call butterfly uses three strikes and four call legs in a 1-2-1 ratio: buy one lower call, sell two middle calls, buy one higher call. Wing widths are equal. You pay a small net debit. Max profit happens if the stock lands on the middle strike at expiration. Max loss is the debit paid.

It is a long volatility, short movement bet in spirit: you pay little upfront but need a fairly tight finish to make meaningful money. Retail accounts often use butterflies for learning payoff shape, not as a primary income strategy, because max profit is a narrow outcome.

Liquidity and execution

The two short middle calls must be openable and closable. If the middle strike has no bid when you need out, you are stuck with legging risk. Butterfly combo orders are not available at all brokers; simulate full round-trip costs before sizing.

Structure

Strikes: K1 < K2 < K3, with K2 − K1 = K3 − K2

Strike	Position	Quantity
K1	Long call	1
K2	Short call	2
K3	Long call	1

• Entry: Net debit.
• Max loss: Debit × 100.
• Max profit: (Wing width − debit) × 100 at K2 at expiry.
• Breakevens: K1 + debit and K3 − debit (approximate; verify with your fills).

Worked example

Stock at $100.

1. Buy 1× $95 call for $7.00.
2. Sell 2× $100 call at $4.00 each ($8.00 total).
3. Buy 1× $105 call for $1.50.
4. Net debit = $7.00 − $8.00 + $1.50 = $0.50 ($50 per butterfly).

Wing width = $5. Max profit = $5 − $0.50 = $4.50 ($450) if stock = $100 at expiry. Max loss = $50.

Payoff at expiration

Stock at expiry	P/L per butterfly (approx.)
$90	−$50 (max loss)
$95	−$50
$97.50	~$0 (lower breakeven)
$100	+$450 (max profit)
$102.50	~$0 (upper breakeven)
$110	−$50 (max loss)

Profit ramps up into K2 and ramps down toward K3.

Greeks for this position

• Delta: Near zero at entry when centered on spot. Becomes positive or negative if price drifts.
• Theta: Negative in the body (you are net long wings vs short middle). Time hurts if the stock sits away from K2.
• Vega: Positive (long optionality in the wings vs short ATM). IV rise can help marks; IV crush hurts. See Vega explained.
• Gamma: Positive near K2 into expiry (you want to land there). Unusual among cheap structures.

Versus iron butterfly: iron is credit, short vol; long butterfly is debit, wants the pin.

When traders consider it

Situation	Long call butterfly vs alternatives
Expect low movement into expiry	Cheaper than long straddle
Strong directional view	Use bull call spread or long call
Collect premium on a range	Iron condor instead

Risks and management

• Low probability of max profit: Perfect pins are rare.
• Commissions: Four legs; debit may be tiny relative to fees.
• Early assignment: Short middle calls can be assigned if ITM.
• IV crush: Hurts before expiration even if stock ends near K2.

Strike selection

Center the middle strike where you expect the stock to finish, not necessarily where it trades today. Narrow wings cost less but offer less dollar profit. Wider wings raise debit but widen the tent.

Common mistakes

• Treating butterflies as "cheap" without respecting low hit rate on max profit.
• Using illiquid middle strikes where the short calls have no volume.
• Holding into expiry with stock between wings but off center (small loss vs hoped pin).

Closing vs holding to expiration

Because max profit is a narrow pin, long butterflies are often closed when the package reaches a target percent gain on the debit, not when max theoretical profit is possible. Holding through expiry with spot between wings but off center still loses the debit. Avoid letting short middle calls go ITM without a plan near expiry.

Mark-to-market before expiration

Long butterflies often look like a slow bleed until spot approaches the middle strike, when gamma can lift the package quickly. IV expansion helps; crush hurts. Because max profit is a pin, open P/L rarely equals max profit until the last days. Do not confuse a small debit with low risk; tail loss is still the full debit.

Tax and reporting (high level)

Four legs, possible partial assignments on short middle calls. Not tax advice.

Practice without capital

Long butterflies are cheap in the builder: model several wing widths on the same expiry and see how debit and max profit scale. Move spot to the middle strike with ten days left and observe gamma. Saved strategies and P/L helps you study pins without trading them.

Related guides

Credit range cousin: iron butterfly. Overview: butterflies and condors overview. Single-leg base: long call.

Reading the payoff chart

Long butterflies show a sharp peak at the middle strike and small max loss at the wings. If the peak does not align with your target price, move the middle strike before trading. Reading payoff charts explains tent shapes versus vertical ramps. Expect most outcomes to be partial gains or full debit loss, not max profit, when you trade butterflies live. Size butterflies smaller than verticals because hit rate on the peak is lower. Use the builder to compare wing widths before you commit to a live debit. Patience matters more than perfect strikes.

Try in ThetaViz

Open long call butterfly builder to set wing width and inspect the peaked payoff curve.

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ThetaViz provides educational tools only. This guide is not investment, tax, or legal advice. Prices, margin requirements, and tax rules change. Confirm details with your broker and qualified professionals before trading.